WO2020159301A1 - 복수의 분할영상 중 재생되는 영상의 전환시점을 제어하는 가상현실 분할영상 전환방법 및 가상현실 영상재생장치 - Google Patents

복수의 분할영상 중 재생되는 영상의 전환시점을 제어하는 가상현실 분할영상 전환방법 및 가상현실 영상재생장치 Download PDF

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Publication number
WO2020159301A1
WO2020159301A1 PCT/KR2020/001513 KR2020001513W WO2020159301A1 WO 2020159301 A1 WO2020159301 A1 WO 2020159301A1 KR 2020001513 W KR2020001513 W KR 2020001513W WO 2020159301 A1 WO2020159301 A1 WO 2020159301A1
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Prior art keywords
image
field
view
fov
split
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PCT/KR2020/001513
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English (en)
French (fr)
Korean (ko)
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정태식
차동우
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주식회사 알파서클
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Priority to CN202080011327.2A priority Critical patent/CN113383539B/zh
Publication of WO2020159301A1 publication Critical patent/WO2020159301A1/ko
Priority to US17/388,041 priority patent/US11321845B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/106—Processing image signals
    • H04N13/111—Transformation of image signals corresponding to virtual viewpoints, e.g. spatial image interpolation
    • H04N13/117—Transformation of image signals corresponding to virtual viewpoints, e.g. spatial image interpolation the virtual viewpoint locations being selected by the viewers or determined by viewer tracking
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
    • G06T7/11—Region-based segmentation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T15/00—3D [Three Dimensional] image rendering
    • G06T15/10—Geometric effects
    • G06T15/20—Perspective computation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T19/00—Manipulating 3D models or images for computer graphics
    • G06T19/006—Mixed reality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/106—Processing image signals
    • H04N13/167—Synchronising or controlling image signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/366—Image reproducers using viewer tracking
    • H04N13/383—Image reproducers using viewer tracking for tracking with gaze detection, i.e. detecting the lines of sight of the viewer's eyes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/014—Head-up displays characterised by optical features comprising information/image processing systems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/20—Special algorithmic details
    • G06T2207/20021—Dividing image into blocks, subimages or windows
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/20—Special algorithmic details
    • G06T2207/20112—Image segmentation details

Definitions

  • the present invention relates to a method for switching a virtual reality divided image and a virtual reality image playback device.
  • the original image that implements virtual reality is an image that covers 360°, it is unnecessary to reproduce an image where a user's gaze does not reach.
  • the split image to be reproduced must be switched as the user's gaze shifts. If the switching point is too late, the screen may be disconnected.
  • the inventor of the present invention has been studied for a long time to solve such a problem, developed through trial and error, and then came to complete the present invention.
  • the present invention is to provide a virtual reality split image switching method and a virtual reality image playback apparatus using the same, so as to control the switching point of a split image played among a plurality of split images so as not to break the screen in order to solve the problems as described above.
  • the purpose is to provide a virtual reality split image switching method and a virtual reality image playback apparatus using the same, so as to control the switching point of a split image played among a plurality of split images so as not to break the screen in order to solve the problems as described above.
  • an object of the present invention is to provide a virtual reality split image switching method for synchronizing the frames of a split image before switching and a split image after switching, and a virtual reality image playback apparatus using the same.
  • One aspect of the present invention for solving the above-described problem is (a) in a temporary segmented image that divides the original image into N regions, a temporary field of view (FOV) covered by the temporary divided image (protected field of view) Guard FOV) to determine the play field of view (Play FOV);
  • step (c) is
  • the conversion criterion in step (c) is to determine the conversion of the divided image to be reproduced using the reference angle ⁇ L of the virtual device field of view determined by the following equation,
  • N is the number of divided images
  • k N-1
  • ⁇ ⁇ f- ⁇ g
  • ⁇ N the field of view/N of the original image
  • ⁇ g is the protective field
  • ⁇ f is the virtual device field
  • ⁇ m is the object in the center of the user's gaze. It is good to add the angle to put it.
  • the protection field (Guard FOV) in step (a) is
  • the head mount display device is set to at least 1/2 of the device field of view (Device FOV).
  • the second aspect of the present invention is an image reproducing unit for reproducing a divided image representing a part of the original image for realizing virtual reality;
  • a virtual field generating unit generating a virtual device field of view (FOV) wider than a device field of view (Device FOV) of the head mounted display device (Additional FOV);
  • Playback video switching to determine the switching of the divided video among the plurality of divided images when one end of the virtual device field of view reaches a change point in the guard field of view included in the play field of view Including wealth
  • Play FOV of the segmented image is generated by adding a Guard FOV to a Temporary FOV covered by a temporary segmented image that divides the original image into N regions.
  • a virtual reality image reproducing apparatus that controls a switching point of a reproduced image among divided images.
  • the screen is played without interruption.
  • the present invention has an effect of preventing a problem in which a previously reproduced past image is reappeared or a scene to be reproduced is skipped by synchronizing the frames of the divided image before and after switching.
  • 1 is a view for explaining the playback field and the virtual device field of view of the present invention.
  • FIG. 2 is a view for explaining a preferred embodiment of the virtual reality split image switching method of the present invention.
  • FIG. 3 is a view for explaining a method of controlling a switching point of time of a divided image in the present invention.
  • FIG. 4 is a view for explaining a method of synchronizing a frame of a divided image before and after switching in the present invention.
  • 1 is a view for explaining the playback field and the virtual device field of view of the present invention.
  • the temporary division image is an image when the original image is divided into n pieces.
  • Temporary field of view is the field of view covered by the temporary split image.
  • Temporary segmentation images do not overlap with each other.
  • the protective field of view refers to a field of view added to both sides of the temporary field of view to expand the temporary field of view.
  • the play field of view is the field of view covered by the divided image, and is a value obtained by adding a temporary field of view and a protective field of view.
  • the plurality of divided images overlap each other as much as the extended protection field.
  • a device field of view refers to a unique field of view that a device such as a head mount display (HMD) can hardwarely cover.
  • the additional field of view is a value added to the device field of view.
  • the virtual device field of view is the sum of the device field of view and the additional field of view, and means the field of view of a virtual device that is wider than the device field of view.
  • the method for converting a virtual reality split image of the present invention may be implemented in a split image generating apparatus.
  • the divided image generating device is a computer device and may be the same device as the virtual reality video player or a separate device.
  • the size of the protective field for expanding the temporary field of view is determined (S1200).
  • the protection field of view is determined by adding the protection field of view to both sides of the temporary field of view (S1300).
  • a segmented image is generated to cover an area as much as the reproduction field of view (S1400).
  • the protective field of view is set to 1/2 or more of the device field of view of the head mounted display device.
  • a device FOV which is a unique field of view of a device such as a head mount display (HMD), is determined (S2100).
  • An additional field of view (FOV) for expanding the device field of view is determined (S2200).
  • a virtual device field of view is determined by adding an additional field of view to the device field (S2300).
  • the virtual device field of view changed according to the user's gaze is compared with the playback field of the divided image being played (S3100).
  • the step of realizing the frame synchronization between the split images before and after the conversion may be further performed by allowing the split image to be converted only in a key frame of the split image.
  • the switching criterion is a divided image reproduced among a plurality of divided images when one end of the virtual device field of view reaches a specific point in the guard field of view included in the play field of view. It can be decided to switch. The specific point above is determined within the scope of the protective field of view.
  • the switching criterion may be determined such that the divided image reproduced is converted using the reference angle ⁇ L of the virtual device FOV.
  • the reference angle will be described in detail in FIG. 3.
  • FIG. 3 is a view for explaining a method of controlling a switching point of time of a divided image in the present invention.
  • the reference angle ⁇ L of the virtual device FOV is defined as in the following equation.
  • the reference angle ⁇ L is the left end of the virtual device field of view. The angle is positive in the counterclockwise direction.
  • the reference angle ( ⁇ L ) of the virtual device field of view (Virtual Device FOV) determined by the above formula it is determined which segmented image the reference angle belongs to, and the reference angle If it is determined that the divided video to belong to is changed, the divided video to be played is switched.
  • the virtual reality image reproducing apparatus controlling the switching point of the reproduced image among the plurality of divided images reproduces the divided image using the above method.
  • the virtual reality image reproducing apparatus may include an image reproducing unit, a virtual field generating unit, and a reproducing image switching unit.
  • the image reproducing unit reproduces a divided image representing part of the original image for realizing virtual reality.
  • the virtual field generating unit generates a virtual device field of view that is as wide as a predetermined additional field of view than the device field of view of the head mounted display device.
  • the playback image switching unit determines the switching of the split image played among the plurality of split images when one end of the virtual device field of view reaches a change point in the guard field of view included in the play field of view. do.
  • Play FOV of the segmented image is generated by adding a Guard FOV to a Temporary FOV covered by a temporary segmented image that divides the original image into N regions.
  • a group of pictures means a set including at least one I frame in MPEG image processing.
  • I Intra-coded
  • P Predictive-coded
  • B Bidirectional-coded
  • the I frame is a key frame and is encoded without reference to other frames. Therefore, the I frame can be decoded independently without referring to other frames.
  • the P frame is encoded with reference to the previous I frame and P frame.
  • the B frame is encoded using both previous and subsequent I frames and P frames. Therefore, it takes a considerable amount of time to decode the B frame.
  • the time required to decode it may increase significantly, which may lead to a failure of synchronization.
  • the present invention maintains a time required for decoding within a predictable range by switching between split images only in key frames.
  • a preferred embodiment of the present invention shortens the key frame distance (KFD) of the segmented image using a predetermined method.
  • KFD key frame distance
  • frame switching between split images before and after switching is performed by switching a split image only in a key frame among frames constituting the split image.
  • the keyframe distance may be shortened through a method that prevents B frames from being included in the image set. This is because the time required for decoding the B frame is considerable.
  • a predetermined delay time must be secured in order to switch only in a keyframe rather than switching immediately.
  • the switch should be delayed by a predetermined delay time, and the screen played during the delay time should be made free of problems.
  • the present invention secures the delay time by the method described below.
  • Tf,m is the time of the m-th keyframe
  • Tf,m+1 is the time of the m+1th keyframe
  • Tss, 1 is the time when the conversion starts.
  • ⁇ t seek is the seek time, which is the time required to find the next keyframe.
  • ⁇ t wait is the waiting time, which is the time to continue playing the segmented image before switching after starting the switching procedure.
  • the divided image is overlapped by a predetermined area, so even if the divided image is continuously played before switching, the screen is not cut off.
  • ⁇ t is the delay time, which is the sum of ⁇ t wait and ⁇ t transit .
  • ⁇ t transit is the transition time, which is the time required to switch frames. For example, it may include physical time to read a video file, decode a frame, and prepare a display.
  • the delay time ⁇ t is the time to be secured in order to switch the divided image played only in the keyframe.
  • the delay time is set to have the following range.
  • T_GOP> ⁇ t ⁇ t wait + ⁇ t transit > ⁇ t seek
  • the delay time should be greater than the time to find the next keyframe of the divided image after playback. I didn't find the keyframe, but it shouldn't be converted. Also, the delay time should be smaller than T_GOP (GOP time).
  • the delay time is set to satisfy the following range.
  • T_overlap is an overlap time, which is a time obtained through the protection field and the virtual device field.
  • the delay time should be smaller than the overlap time. If the overlap time is less than the delay time, the video sync is lost.
  • the overlap time is set as follows.
  • T_overlap T_by_guard_FOV + T_by_virtual_FOV
  • T_by_guard_FOV is the time secured by the protection field of view
  • T_by_virtual_FOV is the time secured by the virtual device field of view.
  • T_overlap is expressed in degrees and head rotation speed, it is as follows.
  • T_overlap (2* ⁇ overlap+ ⁇ dev)/head_angular_speed
  • the head rotation speed cannot be set in advance. What we can see is the maximum head rotation speed.
  • a stable delay time can be secured.
  • Each setting can be secured by statistically measuring the rotational speed of a normal human head.
  • the virtual reality image reproducing apparatus for realizing frame synchronization by controlling a switching point between divided images representing virtual reality of the present invention implements frame synchronization through the above method.
  • the virtual reality image reproducing apparatus may include an image reproducing unit and a segmented video synchronizing unit.
  • the image reproducing unit reproduces a divided image representing part of the original image for realizing virtual reality.
  • the divided image synchronization unit switches a divided image that is reproduced as a user's gaze changes
  • the divided image synchronization unit controls a switching time of the divided image in order to synchronize frames of the divided image before and after switching.
  • the segmented image synchronization unit is characterized in that frame conversion between segmented images before and after switching is performed by switching the segmented image only in a key frame of the segmented image.

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PCT/KR2020/001513 2019-01-31 2020-01-31 복수의 분할영상 중 재생되는 영상의 전환시점을 제어하는 가상현실 분할영상 전환방법 및 가상현실 영상재생장치 WO2020159301A1 (ko)

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CN202080011327.2A CN113383539B (zh) 2019-01-31 2020-01-31 虚拟现实分割影像切换方法及虚拟现实影像再生装置
US17/388,041 US11321845B2 (en) 2019-01-31 2021-07-29 Method and device for controlling transit time of reproduced image among a plurality of segmented images

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KR1020190012523A KR102174794B1 (ko) 2019-01-31 2019-01-31 복수의 분할영상 중 재생되는 영상의 전환시점을 제어하는 가상현실 분할영상 전환방법 및 가상현실 영상재생장치
KR10-2019-0012523 2019-01-31

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US11321845B2 (en) 2022-05-03
KR20200095004A (ko) 2020-08-10
CN113383539A (zh) 2021-09-10
CN113383539B (zh) 2022-08-02

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